when does the heart produces the sound LUBB and DUBB during heart beat
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The heart makes the following sounds:-
LUBB - when the atrio-ventricular valves shut ,i.e., when the bicuspid and the tricuspid valves shut.
DUBB- when the semilunar valves closes,i.e.,when the aortic and the pulmonary semilunar valve closes.
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